Founding Full-Stack Engineer

Role : Founding Full-Stack Engineer

Employment Type : Full-time, On-site

Location : San Francisco, CA

Compensation : $170k - $230k base + competitive equity

Visa : Not available

Company Overview

Kaizen builds reinforcement learning environments that allow AI to train from its own experience instead of relying on human-labeled data - solving the core infrastructure bottleneck to achieving autonomous agentic AI systems .

In just 5 months , they've secured massive contracts with frontier AI labs , have a 3-person founding team , and are scaling rapidly with strong funding and runway.

Role Summary

As employee #4, you will own features end-to-end across the stack - from database to UI - and build production systems that support high-volume autonomous AI training workloads for the world's top AI research labs.

Key Responsibilities

• Architect full-stack applications with React.js (frontend) and Python (backend)
• Deploy scalable infrastructure on AWS / GCP for AI training systems
• Transform cutting-edge AI research into production-ready tools
• Lead technical decisions in a microservices architecture
• Help define engineering culture as the team grows from 3 → 30+ engineers

Ideal Candidate Profile

Culture & Work Style